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RISS 인기검색어
- 검색키워드
- 저자 : Bhusan Khatua, Bhanu (검색결과 2 건)
- 무료
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Maiti, Sandip,Kumar Karan, Sumanta,Lee, Juhyun,Kumar Mishra, Avnish,Bhusan Khatua, Bhanu,Kon Kim, Jin Elsevier 2017 Nano energy Vol.42 No.-
<P><B>Abstract</B></P> <P>Development of non-toxic, ultra-sensitive, and flexible bio-inspired piezoelectric nanogenerator has become a great challenge for next generation biomedical applications. High performance organic/inorganic materials based piezoelectric nanogenerators suffer from several unavoidable problems such as complex synthesis and high toxicity. Biodegradable and biocompatible piezoelectric material is utmost needed in in-vivo condition to harvest energy for biomedical applications. Here, we report a novel bio-piezoelectric nanogenerator (BPNG) using naturally abundant self-aligned cellulose fibrous untreated onion skin (OS) as efficient piezoelectric material having piezoelectric strength of ∼ 2.8 pC/N. The fabricated OSBPNG generated output voltage, current, instantaneous power density and high piezoelectric energy conversion efficiency of ≈ 18V, ≈ 166nA, ≈ 1.7μW/cm<SUP>2</SUP>, and ≈ 61.7%, respectively, and turn on 30 green LEDs by a single device under repeated compressive stress of ≈ 34kPa and ≈ 3.0Hz frequency. In addition, maximum output voltage (≈ 106V) was achieved when 6 units are connected in series, which instantaneously turns on 73 combined LEDs (30 green, 25 blue, and 18 red). OSBPNG is highly effective during throat movement such as coughing, drinking and swallowing. Furthermore, because it works at very low pressure originating from heart pulse or beat, it could be used in pacemakers and health care units. Finally, OSBPNG successfully differentiates speech signals, indicating its potential for speech recognition.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel homespun approach for bio-piezoelectric nanogenerator (OSBPNG) using onion skin. </LI> <LI> Plant materials are more useful than living creatures in both handling and supply. </LI> <LI> It works at low pressure even from heart pulse, that can be used in health care unit. </LI> <LI> OSBPNG shows output voltage of 18 V with high energy conversion efficiency (61.7%). </LI> <LI> Maximum output voltage (106 V) achieved by assembling 6 units, which turn on 73 LEDs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Naturally driven bio-waste and biocompatible onion skin base piezoelectric nanogenerator with high output performance (output voltage and area power density of ≈ 18V, and ≈ 1.7μW/cm<SUP>2</SUP>) and high energy conversion efficiency (≈ 61.7%) has been fabricated through simple homespun device fabrication method. More details on the materials and application can be found in the manuscript.</P> <P>[DISPLAY OMISSION]</P>
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Nature driven spider silk as high energy conversion efficient bio-piezoelectric nanogenerator
Karan, Sumanta Kumar,Maiti, Sandip,Kwon, Owoong,Paria, Sarbaranjan,Maitra, Anirban,Si, Suman Kumar,Kim, Yunseok,Kim, Jin Kon,Khatua, Bhanu Bhusan Elsevier 2018 Nano energy Vol.49 No.-
<P><B>Abstract</B></P> <P>Spider silk fibers having remarkable protein sequence structure contain nature's most outstanding mechanical properties and unrivalled elasticity along with biocompatibility and biodegradability. Unfortunately, it remains completely unidentified how the mechanical properties of spider silk effectively contribute to the performance and integrity on piezoelectric nanogenerator. Here, using piezoresponse force microscopy (PFM), we report for the first time structure-dependent piezoelectric response of the spider silk at the molecular level and confirm that silk fiber shows vertical (or out of the plane) piezoelectric coefficient of up to ~ 0.36 pm/V. We also design a mechanically robust piezoelectric nanogenerator (PNG) using nature driven spider silk that exhibits high energy conversion efficiency (≈ 66%), high output voltage (≈ 21.3 V) and current (≈ 0.68 μA) with instantaneous power density of ≈ 4.56 μW/cm<SUP>2</SUP>. The fabricated device is biocompatible and ultra-sensitive towards physiological signal monitoring such as arterial pulse response which can be useful for potential biomedical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spider-silk (SS) shows vertical piezoelectric coefficient (≈ 0.36 pm/V) as confirmed by PFM. </LI> <LI> Nature driven spider silk as an effective bio-piezoelectric nanogenerator (SSBPNG). </LI> <LI> SSBPNG shows power density (≈ 4.56 μW/cm<SUP>2</SUP>) and energy conversion efficiency (≈ 66%). </LI> <LI> Multiple devices in series connection can generate 65 V and turn on 55 LEDs. </LI> <LI> One-dimensional (1D) wire type SSBPNG could be as a promising textile nanogenerator. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P> <B>This study provides an in-depth insight of naturally abundant spider silk as bio-piezoelectric material.</B> We have successfully shown that spider silk has a definite vertical piezoelectric coefficient (∼ 0.36 pm/V) through PFM experiment which is newly added information to the existing piezoelectric history on silk. The fabricated energy harvester with energy conversion efficiency of ≈ 66%, reveals high output performance with instantaneous power density of ≈ 4.56 μW/cm<SUP>2</SUP>.</P> <P>[DISPLAY OMISSION]</P>
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